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24bit ADCs target temperature measurement

Designed with temperature measurement (RTDs, thermocouples, thermistors), flow/pressure measurement and industrial process control applications in mind, Texas Instruments latest 24bit analog-to-digital converters (ADCs) are said to provide a highly integrated, yet low noise and power consumption front-end.

The ADS1248 and ADS1247 integrate dual matched current digital-to-analog converters (DACs), low drift internal reference, oscillator, temperature sensor, burnout detection and eight general purpose I/Os. The device also features a programmable gain amplifier (PGA), providing selectable gains of 1 to 128 (40nV at G=128). Both parts support data rates to 2kSamples/s, at which power dissipation is 2.56mW, when the PGA is set to a gain of 16.

An input multiplexer supports four differential inputs, or 7 single-ended inputs for the ADS1248; with two differential, or three single-ended inputs supported by the ADS1247.

Both devices are available immediately in a TSSOP-20 package. For applications that require a smaller package, the single-channel ADS1246 provides a reduced feature set in a TSSOP-16 package. Samples and evaluation models can be found at TI’s website.

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